California Air Tools 3010 Service Manual Page 475

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ELECTRICAL SYSTEM 17-55
Switches and Sensors
Coolant Temperature Switch Inspec tion
Remove the coolant temperature switch (see Coolant
Temperature Switch Removal in the Cooling System
chapter).
Suspend the switch [A] in a container of coolant so that
the temperature sensing projection and threaded portion
are submerged.
Suspend an accurate thermometer [B] in the coolant, so
that the sensitive portions [C] are located in almost in the
same depth.
NOTE
The switch and thermometer must not touch the con-
tainer sides or bottom.
Place the container over a source of heat and gradu-
ally raise the temperature of the coolant while stirring the
coolant gently.
Using the hand tester, measure the internal resistance
of the s witch across the connector and the body at the
temperatures shown in the table.
Special Tool - Hand Tester: 57001-1394
If the hand tester does not show the specified values, r e-
place the switch.
Coolant Temperature Switch Resistance
Rising Temperature:
From OFF to ON at 112 118°C ( 23 4 244°F)
Falling Temperature:
From ON to OFF within 10°C (50°F)
of “ON” temperature
ON: Less than 0.5
OFF: More than 1 M
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